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Work around 32 bits epoll_wait() bug #1349

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Merged
merged 1 commit into from
Sep 28, 2020
Merged

Work around 32 bits epoll_wait() bug #1349

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10 changes: 9 additions & 1 deletion src/sys/unix/selector/epoll.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -46,8 +46,16 @@ impl Selector {
}

pub fn select(&self, events: &mut Events, timeout: Option<Duration>) -> io::Result<()> {
// A bug in kernels < 2.6.37 makes timeouts larger than LONG_MAX / CONFIG_HZ
// (approx. 30 minutes with CONFIG_HZ=1200) effectively infinite on 32 bits
// architectures. The magic number is the same constant used by libuv.
#[cfg(target_pointer_width = "32")]
const MAX_SAFE_TIMEOUT: u128 = 1789569;
#[cfg(not(target_pointer_width = "32"))]
const MAX_SAFE_TIMEOUT: u128 = libc::c_int::max_value() as u128;

let timeout = timeout
.map(|to| cmp::min(to.as_millis(), libc::c_int::max_value() as u128) as libc::c_int)
.map(|to| cmp::min(to.as_millis(), MAX_SAFE_TIMEOUT) as libc::c_int)
.unwrap_or(-1);

events.clear();
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